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Hotfix SPB16.60.072 Base release not found

Hello,

Today I've been trying to install a hotfix for Cadence Allegro 16.6: Hotfix SPB16.60.072. Can someone help me to fix this error?

SPB 16.6 Base release not found. ISR installation will be aborted.

I mostly worked with 16.3 and 17.2, but for one assignment I had to use 16.6 and I installed it. I use the licence of 17.2, because with that licence older versions should also work. Or do I really have to converte licence.dat to the 16.6 licence?

I use:

OrCAD PCB Designer Professional

16.6 P004 (v16-6-112G)

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